Journal of the Korea Academia-Industrial cooperation Society
/
v.19
no.4
/
pp.492-504
/
2018
This study was conducted to investigate the effects of seaweed peeling (SP), glycolic acid peeling (GP) and general scrub (GS), which are widely known as cures for acne in both medicine and esthetics on the keratosis pilaris skin and provide basic data for a keratosis pilaris improvement program. For the experiment, subjects were categorized into control (GS) and experimental (GP and SP) groups, and tests were performed on arms and legs with relatively high keratosis pilaris symptoms (5 parts for each group) for 6 weeks. The keratin quantity, sebum content, moisture level and pigmentation were measured before and after (2, 4 and 6 weeks) the experiment and comparatively analyzed. The GP group showed an increase in moisture level (t=-4.064, p<0.01) but a decrease in pigmentation (t=3.536, p<0.01), while a decrease in keratin quantity (t=2.370, p<0.05) and pigmentation (t=4.017, p<0.01) was observed in the SP group and a decrease in keratin quantity (t=2.834, p<0.05) and an increase in moisture level (t=-7.589, p<0.001) was observed in the control group (GS). Additionally, the skin irritation reaction was lowest in the GS group. The SP group had the highest satisfaction with the improvement in response to keratosis pilaris care. When asked if they were willing to get the treatment with the same product, both SP and GP groups were high. In other words, keratosis pilaris care was needed in both experimental and control groups. Overall, the results of this study indicate that SP, GP and GS, which are commonly used in remedying acne, normalize turnover cycle by removing the dead cells from around the pores and improve keratosis pilaris symptoms by increasing moisture in the skin. Therefore, to improve keratosis pilaris skin, it is important to keep removing keratin and using a moisturizer that provides a skin barrier on a regular basis. The results presented herein will be useful as basic data for a keratosis pilaris improvement program.
This study was conducted to investigate a potential of Yellow poplar (Liriodendron tulipifera L.) as a raw material for the manufacturing of particleboard (PB) and oriented strandboard (OSB). PB panels were prepared at the parameters of $0.7g/cm^3$ density, 15 mm thickness, three-layer, $E_1$ grade urea-formaldehyde (UF) resin, emulsion wax, and hardener. OSB panels were manufactured with a density of $0.65g/cm^3$, thickness of 10 mm, and $E_1$ grade of UF resin. Particle size of the face layer of PB was 20~80 mesh with 7~9% moisture content (MC), while that of core-layer was 3~20 mesh with 3~5% MC, which was similar to the production condition of commercial PB. As a result, the manufactured PB panels with 15.8 mm thickness, $0.7g/cm^3$ density, and 5.8% MC satisfied the requirement of bending strength of 15 type PB of Korean Industrial Standard (KS F 3104). Both internal bonding (IB) strength and surface screw withdrawal resistance also satisfied the requirement of 18 type PB of the standard. But, the edge screw withdrawal resistance satisfied the requirement of 15 type PB of the standard. These differences in properties could be due to the slenderness ratio of raw particles. In case of OSB panels with 10.7 mm thickness, $0.68g/cm^3$ density, and 5.8% MC satisfied all the requirements of bending strength, screw withdrawal resistance, and IB strength of 18 type PB of the standard. These results suggest that Yellow poplar wood has a good potential as a raw material for the production of PB and OSB.
Proceedings of the Plant Resources Society of Korea Conference
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2018.10a
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pp.26-27
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2018
With entry into force of the Nagoya Protocol to promote the fair sharing of the benefits of accessing and utilizing genetic resources, much support has been given to research on the development of biomaterials and products using domestic natural resources. Conservation and resource-saving of native species became very important through Nagoya Protocol enactment. The trend of cosmetic industry has been shifing from use synthetic chemicals to natural biomaterials, due to the safety regulations on new materials, ban on animal experiments, and expansion of cosmeceuticals range. In addition, functional cosmetic range has been expanded from whitening, wrinkle improvement, and ultraviolet shielding, to hair loss, hair loss alleviation, acne relaxation, and moisturizing of atopic skin, thus causing the activation of research about field of efficacy evaluation on natural biomaterials and commercialization. Chungbuk province is fostering the bio industry as a key industry for regional economic growth. For this purpose, Osong Biotechnology Complex/Ochang Science Industrial Complex in middle area, Jecheon biovalley in northern region, and Chungju Enterprise city have been established, thus playing a pivotal role in Bio innovative cluster in Korea. In particular, it was established the osong cosmetics clinical research support center to develop the cosmetics industry in chungbuk, thereby supporting clinical trials, efficacy evaluations, overseas certification, and overseas market entry in order to advance into the global market. In addition, oriental plants such as astragalus propinquus, schisandra chinensis, eucommia, alpiniae oxyphyllae fructus and biancaea sappan are being actively studied as global cosmetic ingredients through the promotion of various national research and development projects using natural materials in chungbuk province. The chungbuk natural product industry is expected to grow further throughout cosmetics industry development in the future, as companies and research institutes are actively promoting the secure index of effective material in natural products and effective material commercialization.
Journal of the Korean Society of Food Science and Nutrition
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v.39
no.4
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pp.602-612
/
2010
This study was conducted to investigate the state of hygiene education aimed for by bakers, and the evaluations of the importance and the performance concerning sanitary characteristics by the bakers. The questionnaires were administered to 186 bakers in Busan and the data evaluated by 5 scales method of Likert were statistically analyzed. 20.4% of bakers have not received hygiene education. Only 32.8% of bakers have experienced hygiene education regularly. The more the bakers were educated, the more they practiced the contents of hygiene education. The major reason of education unfulfilment was due to insufficient equipments and facilities. The scores of the hygienic performance of educated bakers were significantly (p<0.05) higher than those of uneducated bakers in food sanitation, especially for sanitary characteristics on inspection, pre-preparation and distribution. The mean scores of the importance and the performance evaluated by bakers were 4.05/5.00 and 3.76/5.00, respectively. The bakers assessed the highest scores on the importance and the performance of personal hygiene. The gap score was -0.30 between the importance and the performance for sanitary characteristics. The baker recognized that sanitary management was not performed as much as they recognized its importance. The importance and the performance grid of bakers revealed that the items of checking the certification for the origin of new food ingredient, inspecting deliveries as quickly as possible, separation between preparing and breading time, thawing frozen food under running tap water/in refrigerator, separating disposal gloves and utensils by the purpose, putting products in cleaned and sterilized utensils, letting consumes know the expiration date of products, preventing a rubber hose from being left on the kitchen floor, checking insect nets frequently and so on showed lower scores compared to the mean scores of the importance and the performance. The levels of the hygienic performance by bakers were positively correlated (p<0.01) with the recognitions of the importance on sanitary characteristics. These results might provide basic data for hygienic training and play a role on the improvement of the sanitary management in bakery.
Journal of the Korean Society of Food Science and Nutrition
/
v.41
no.3
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pp.376-382
/
2012
This study examined the effects of acorn (Quercus. acutissima CARR.) jelly powder (0%, 25%, 50%, and 75%) and acorn extract (0%, 0.1%, 0.5%, and 1.0%) addition on the quality characteristics of hardtack. In the sensory test, acorn jelly powder added group scored 50% higher than the other added group. Regarding hardtack color, L (lightness) and b (yellowness) values decreased with increasing acorn powder and acorn extract addition. Hardness of hardtack increased with added acorn jelly powder, but no significant difference was observed with acorn extract. The taste and texture of the hardtack 0.1% acorn extract added group significantly increased. Overall, preferences decreased with increasing acorn extract but not significantly. In conclusion, the results of this study suggest that addition of 50% acorn jelly powder in combination with addition of less than 0.1% acorn extract to hardtack was the most desirable.
Kim, Young-Hye;Kang, Yu-Ju;Lee, In-Seon;Kim, Hyang-Sook
Journal of the Korean Society of Food Science and Nutrition
/
v.39
no.2
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pp.244-252
/
2010
This study aimed to offer groundwork for grasp and evaluation of nutritional status and dietary fiber intake through 24-hr recall method among middle school students in Chungbuk area. In addition, this study attempted to develop food frequency questionnaire (FFQ) for dietary fiber intake. Average calorie intake per person a day was 2035.6 kcal for boys, and 1876.7 kcal for girls which were 75.4% and 93.8% of estimated energy requirement (EER), respectively. Percent estimated average requirements (%EAR) of calcium, iron and folate were the lowest showing 34.3%, 54.2%, 67.5% for boys and 36.6%, 59.2%, 64.4% for girls, respectively. Average dietary fiber intake per day was $17.6\pm5.3$ g for boys and $16.5\pm4.8$ g for girls which indicate 54.8% and 68.8% of adequate intake (AI), respectively. The main food sources of dietary fiber were polished rice and kimchi. The main food source groups were vegetables, cereals and their products were fruits, seaweeds in the order named, indicating 68.44% total dietary fiber intake from vegetables and cereals. From preliminary 39 food items, 19 food items were selected to derive the correlation coefficient of each food item between 24-hr recall and FFQ method. Correlation coefficient was increased from 0.71 to 0.78 with significant level of p<0.01 after adjustment of FFQ from 39 items to 19 items set. Percentage of classifying subjects into the same levels by food frequency questionnaire and 24-hr recall based on joints classification quartile Kappa value was evaluated. Agreement was highest in the second lowest group showing percentage to correspond rose from 90.2% to 92.4% and Kappa value of 0.54 to 0.59. Consequently, FFQ developed in this study would be useful for estimating the groups which show low intake.
Bae, Jung Eun;Kim, Chan Kyung;Kim, Sungpo;Yang, Eun Kyung;Kim, In Seop
Korean Journal of Microbiology
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v.48
no.4
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pp.314-318
/
2012
Most types of collagen used for biomedical applications, such as cell therapy and tissue engineering, are derived from animal tissues. Therefore, special precautions must be taken during the production of these proteins in order to assure against the possibility of the products transmitting infectious diseases to the recipients. The ability to remove and/or inactivate known and potential viral contaminants during the manufacturing process is an ever-increasingly important parameter in assessing the safety of biomedical products. The purpose of this study was to evaluate the efficacies of the 70% ethanol treatment and pepsin treatment at pH 2.0 for the inactivation of bovine viruses during the manufacture of collagen type I from bovine hides. A variety of experimental model viruses for bovine viruses including bovine herpes virus (BHV), bovine viral diarrhea virus (BVDV), bovine parainfluenza 3 virus (BPIV-3), and bovine parvovirus (BPV), were chosen for the evaluation of viral inactivation efficacy. BHV, BVDV, BPIV-3, and BPV were effectively inactivated to undetectable levels within 1 h of 70% ethanol treatment for 24 h, with log reduction factors of ${\geq}5.58$, ${\geq}5.32$, ${\geq}5.11$, and ${\geq}3.42$, respectively. BHV, BVDV, BPIV-3, and BPV were also effectively inactivated to undetectable levels within 5 days of pepsin treatment for 14 days, with the log reduction factors of ${\geq}7.08$, ${\geq}6.60$, ${\geq}5.60$, and ${\geq}3.59$, respectively. The cumulative virus reduction factors of BHV, BVDV, BPIV-3, and BPV were ${\geq}12.66$, ${\geq}11.92$, ${\geq}10.71$, and ${\geq}7.01$. These results indicate that the production process for collagen type I from bovine hides has a sufficient virus-reducing capacity to achieve a high margin of virus safety.
The purpose of this study was to introduce the toxicological study review to evaluate the safety of PDMS on the 69th JECFA meeting. Polydimethylsiloxane is a polymer and its ADI was established at 23rd JECFA meeting in 1979. The ADI was maintained although the specification was expanded at its 26th, 29 th, 37 th meetings. Recently, it was reported that PDMS with low molecular weight and viscosity has high absorption rate and different toxicity, so it was submitted at 69th meeting. Toxicological studies of PDMS were submitted from the sponsor and additional information is collected from a document searching. The toxicological studies were reviewed in accordance with the 'Guidelines for the preparation of toxicological working papers for the Joint FAO/WHO Expert Committee on Food Additives'. In the available acute, sub-chronic and chronic toxicity studies on PDMS, dose-related increases in incidence and severity of ocular lesions(corneal crystal, inflammation of the corneal epithelium etc.) were consistently observed after oral dosing. It seems to be a local irritant effect, but the mechanism by which the ocular lesions arose is unclear, although the lack of absorption of PDMS indicates that it is unlikely to be a direct systemic effect. Consequently, the relevance of the ocular lesions for food use of PDMS could not be determined. The ADI of PDMS was re-established from 0-1.5 mg/kg bw/day to 0-0.8 mg/kg bw/day by applying additional safety factor 2 based on its ocular toxicity. The result of 0-0.8 mg/kg bw/day is a temporary ADI until further data are provided to 2010.
Proceedings of the Korean Institute of Navigation and Port Research Conference
/
2004.04a
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pp.5-9
/
2004
In this paper, we studied the OCT(Optical Coherence Tomography) system which it has been extensively studied because of having some advantages such as high resolution cross-sectional images, low cost, and small size configuration. A basic principle of OCT system is Michelson interferometer. The characteristics of light source determine the resolution and the transmission depth. As a results, the light source have a commercial SLD with a central wavelength of 1,285 nm and FWHM(Full Width at Half Maximum) of 35.3 nm. The optical delay line part is necessary to equal of the optical path length with scattered light or reflected light from sample. In order to equal the optical path length, the stage which is attached to reference mirror is moved linearly by step motor And the interferometer is configured with the Michelson interferometer using single mod fiber, the scanner can be focused of the sample by using the reference arm. Also, the 2-dimensional cross-sectional images were measured with scanning the transverse direction of the sample by using step motor. After detecting the internal signal of lateral direction at a paint of sample, scanner is moved to obtain the cross-sectional image of 2-demensional by using step motor. Photodiode has been used which has high detection sensitivity, excellent noise characteristic, and dynamic range from 800 nm to 1,700 nm. It is detected mixed small signal between noise and interference signal with high frequency After filtering and amplifying this signal, only envelope curve of interference signal is detected. And then, cross-sectional image is shown through converting this signal into digitalized signal using A/D converter. The resolution of the OCT system is about 30$\mu\textrm{m}$ which corresponds to the theoretical resolution. Also, the cross-sectional image of ping-pong ball is measured. The OCT system is configured with Michelson interferometer which has a low contrast because of reducing the power of feedback interference light. Such a problem is overcomed by using the improved inteferometer. Also, in order to obtain the cross-sectional image within a short time, it is necessary to reduce the measurement time for improving the optical delay line.
Kim, Seung Tae;Heo, Chang Hoe;Kim, Sung Hoon;Lee, Won Jong
Journal of Food Hygiene and Safety
/
v.35
no.1
/
pp.75-82
/
2020
The purpose of this study was to establish optimized extraction conditions for Lilium bulb and Lespedeza cuneata G. Don and to investigate the storage stability of beverages containing extracts. The hot-water extract and the 60% ethanol extract had the highest DPPH radical scavenging activities as well as the highest total polyphenol content. The total polyphenol content, total flavonoid content and DPPH radical scavenging activity were the highest when the Lilium bulb extract was mixed with the Lespedeza cuneata G. Don extract at the ratio of 1:4. Storage stability of beverages was determined during storage at 10, 25, and 35℃ for 6 months. The pH was decreased from 4.15 to 4.01-4.05, while the acidity was increased from 0.60% to 0.70-0.75% after storage for 6 months. The soluble solid contents were not changed during storage of 6 months. The DPPH radical scavenging activity was decreased after 4-6 months. The Hunter b (yellowness) values decreased at 35℃ after storage for 6 months while the lightness (L) and redness (a) were not changed during storage for 6 months. The total saponin content was not remarkably changed during 2 months of storage, while it decreased after 4-6 months of storage. The flavonoid content was decreased 47% and 55% from an intial 21.7 mg/100 mL to 10.3 mg/100 mL and 12.0 mg/100 mL after 1 month of storage and then remained stable until 6 months. General bacteria and coliform group were not detected during storage for 6 months.
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